Affiliation: | 1. Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Kobe, Hyogo, Japan;2. Frontier Research Laboratory, National Institute of Information and Communications Technology, Koganei, Tokyo, Japan;3. World Premier International Research Center‐Advanced Institute for Materials Research (WPI‐AIMR), Tohoku University, Aoba‐ku, Sendai, Japan |